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2011 XC90 - My car eats batteries for lunch...

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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JohnCC
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Re: 2011 XC90 - My car eats batteries for lunch...

Post by JohnCC » Sat Feb 23, 2019 9:48 am

I have been doing something similar, when I remember. The battery is always showing a good charge state when I shut it down, 12.6 volts or so, and generally shows about 12.3 the next morning. 12.3 indicates significantly under charged, and even if it is not accurate, a drop of 0.3 volts seems significant. I did pull that fuse once, and don't remember the numbers, but I recall I decided it did not fix the problem.

The problem is, I'm so programmed to jump in and start the car that getting consistent, frequent readings is a problem.


John C
2011 XC90 3.2
166,000 miles and counting
1965 122S B18D gone but not forgotten
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Re: 2011 XC90 - My car eats batteries for lunch...

Post by abscate » Sun Feb 24, 2019 6:20 am

Measure the battery voltage after shutdown and 30 seconds of headlights on

You need to deplete the surface charge from the battery before measuring resting voltage


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Re: 2011 XC90 - My car eats batteries for lunch...

Post by RickHaleParker » Sun Feb 24, 2019 7:14 am

Use to pick up late 90s Lincoln Continentals dirt cheap because they ate through batteries and alternators. Would take them and redo the grounding straps to the firewall, problem solved.

You might want to check all your main grounds ....


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JohnCC
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Re: 2011 XC90 - My car eats batteries for lunch...

Post by JohnCC » Sun Feb 24, 2019 8:17 am

abscate wrote:
Sun Feb 24, 2019 6:20 am
Measure the battery voltage after shutdown and 30 seconds of headlights on
I turn the key to position 1 and wait about 30 seconds, until the reading stabilizes. After a long trip it usually settles down around 12.6 and after a short trip more like 12.4.


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Re: 2011 XC90 - My car eats batteries for lunch...

Post by oragex » Sun Feb 24, 2019 9:43 am

JohnCC wrote:
Sat Feb 23, 2019 9:48 am
I have been doing something similar, when I remember. The battery is always showing a good charge state when I shut it down, 12.6 volts or so, and generally shows about 12.3 the next morning. 12.3 indicates significantly under charged, and even if it is not accurate, a drop of 0.3 volts seems significant. I did pull that fuse once, and don't remember the numbers, but I recall I decided it did not fix the problem.

The problem is, I'm so programmed to jump in and start the car that getting consistent, frequent readings is a problem.
0.3v over night means about 30-40% discharge, clearly a parasitic drain somewhere

I'd recommend this in the first place, to disconnect it each night, it will save you the battery for now. Remember to have the key in POS II when reconnecting and make sure trunk and door locks work manually. Charging -discharging a car battery is what is killing them, unlike a phone battery, lead acid ones hate being discharged.

www.youtube.com/watch?v=lMT1RdnkxnY

www.youtube.com/watch?v=jdW0t2FJCfA

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JohnCC
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Re: 2011 XC90 - My car eats batteries for lunch...

Post by JohnCC » Sun Feb 24, 2019 12:58 pm

oragex wrote:
Sun Feb 24, 2019 9:43 am
make sure trunk and door locks work manually.
Ay, there's the rub. No way to get in the (locked) tailgate without the battery and no (easy) way to connect the battery without opening the tailgate...


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Re: 2011 XC90 - My car eats batteries for lunch...

Post by abscate » Mon Feb 25, 2019 4:56 am

That is such a PITA isn’t it? Happens on my P2 and the E83 Bimmer

You can run a pigtail out of the trunk and hook up a jump battery to open the trunk , BTDT


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